Capella Flavors with Stevia. Stevia is the all-natural, zero-calorie herbal sweetener. Native to South America, the stevia plant is a small shrub that has been used as a source of natural, zero-calorie sweetness for hundreds of years. Capella Flavors offers a diverse and delicious line of water soluble, highly concentrated, multi-purpose flavoring - enjoy deep aroma, dense concentration and unparalleled taste. Capella Flavors are proudly made with the finest ingredients in the USA.